61186003L1-1D 7-13DLP-501Mount Shelf, Heat Baffle, and FanINTRODUCTIONThis procedure provides step-by-step instructions for mounting shelves, heat baffles, and fansfor the MX2820 system. This procedure provides step-by-step instructions for the followinginstallations:• Shelf with passive heat baffle• Shelf with heat baffle and fan assembly• Shelf with pusher fan assemblyNOTERefer to “Configuration Guidelines for the MX2820 System” in“Section 2” of this manual for ADTRAN Part Numbers, illustrations,and engineering specifications.ShelfThe shelf comes with mounting brackets that allow it to be flush-mounted or mid-mounted inthe rack.Passive Heat Baffle (Passively Cooled)A Passively cooled system does not include fans. Heat baffles are installed to divert rising heataway from shelves.Heat Baffle with Fan Assembly (Actively Cooled, Multiple Shelf)A combination heat baffle and fan assembly provide forced-air ventilation for the MX2820shelf. The fan assembly is designed to mount on the rear of the heat baffle.The fan assembly accommodates two power inputs, each input consisting of a –48 VDC feedand a battery return feed. The power inputs are on 0.375 inch centers. A frame groundterminal is also provided on the rear of the assembly. The unit operates with either one orboth inputs active. In the event of a fan failure, the unit provides for an alarm indication. TheAUX3 environmental alarm input on the System Controller Unit (SCU) must be set to act as afan alarm to indicate a fan failure.
